Occlusion

Occlusion refers to the static and dynamic relationship between the upper and lower teeth when they come into contact during jaw closure, chewing, and excursive movements. In an ideal occlusion, the cusps of the maxillary teeth fit precisely into the fossae and embrasures of the mandibular teeth, distributing masticatory forces evenly across the dental arches. Occlusion is classified using the Angle system, which categorizes the mesiodistal relationship of the first molars into Class I (normal molar relationship), Class II (mandibular molar positioned distally), and Class III (mandibular molar positioned mesially). Beyond this static classification, functional occlusion covers the dynamic contacts that occur during lateral and protrusive jaw movements, including canine guidance and group function patterns.

Malocclusion, or improper occlusion, is one of the most prevalent conditions treated in dentistry and can result from skeletal discrepancies, dental crowding, missing teeth, or habits such as thumb sucking. The consequences of untreated malocclusion extend beyond cosmetic concerns and may include temporomandibular joint disorders, uneven tooth wear, chronic headaches, difficulty chewing, and increased susceptibility to caries and periodontal disease in areas of crowding or poor alignment. Occlusal evaluation is a routine component of complete dental examinations and informs treatment decisions across multiple disciplines, including orthodontics, prosthodontics, restorative dentistry, and periodontics. Occlusal adjustments, which involve selectively reshaping tooth surfaces to improve contact patterns, are performed to relieve bite interferences that contribute to pain or prosthetic complications.

Occlusion-related procedures appear throughout the CDT code system. Occlusal adjustment by selective reshaping is coded under D9951 and D9952 depending on whether it is limited or complete. Orthodontic treatment to correct malocclusion falls under the D8000 series, and occlusal guards for bruxism are billed as D9944 or D9945. Insurance coverage for occlusion-related treatment varies widely, with many plans covering orthodontics only for dependents under age 19 and excluding occlusal adjustment as a standalone procedure. The billing team should document the Angle classification, specific functional problems, and clinical symptoms when submitting claims for occlusion-related services, as this objective documentation strengthens the medical necessity argument and improves the likelihood of claim approval.